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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b407813af71490c69422c6218ab5fef50efb5761b1da54b4efa1d4e43e4cc6' 
  AND token = 'r/sFL3xk5ti8fk/De0FT9+c6X2g0BNLLLBiEzNZ6pps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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