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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dbf8e1d8c86adc2b531b7bbcde1ceeb5c526e1e6302a0e3976032d4342efe3' 
  AND token = 'f+tKqFyWQShLLkzV+/yvR1n2BdYN7p/weEZZ+Pah8h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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