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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53871cd5af59a3df4a180d3a5e9a51f3c4eac275d8f5912d540beb699d0644d' 
  AND token = 'vcQbFijwN5or5ipDIEso/DE0TFeG3s9byeAZ7NoNWzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}