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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f9e13a1e2a8236ddf9aad848b314f8575566279ca2edba49d4679bbed79c13' 
  AND token = 'cJHOq31rNAPO4cQZhAdXnT6j3kZ8ELf7GaJ5uJUxKqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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