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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e09d9a14b83dfc383d8e8c5970afc22e34e3217d6fa4d755f104df87cafc9d' 
  AND token = '7ANjZu4hBhaegfGsyzYAncDU7Hb0gwrdg2IehnnURNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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