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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4bba9d0efccebf677dc32dd8f349c98830dfde2b7a7c6f3d2d110696bb72f8' 
  AND token = 'QOJ71S/JDA8GHCB+m34XbHznVTy+X/GNCF2W1ExxcTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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