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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caed518825b4412c256850a843e04bd11470fecd36a4cb5f33dbe6c13590fc2e' 
  AND token = '4+PAJTKGFYfImpICms5xbF0GoICF3y6dlc4Sna2QtGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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