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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ee478ba40071adc25bb844a520fa529eb111bba7b58072e51651c74e3a4987' 
  AND token = 'wpB7HQf/s7r1qcTq/UtLoasYdLrTi5BrlWJEYsYU0Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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