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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc9d1426ca1a1bba2a408d50d736cb99955116d1f336a9b7a8cac38420d676a' 
  AND token = 'Xpf8MI04L6KjaGk+3PmRGz3RGF+CdXz6RPNFyWKGX2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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