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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c27df8d56976fabbee88de0749d3cfe59096e28f87153200489db5eb83e32a9' 
  AND token = 'GQpyJoegc6itAt/AdPP8uYEjWD6oLLRZ7e3h7y+4QWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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