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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6297beed3c7ec81ce52c9189bb6bba231b4c518d0d20995ab72d66cf45528142' 
  AND token = '3T0vFbX8oBYKqfDLB9FvIE5FQB0s9GkDRWSamITWQ3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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