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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcb95faa89de24377b0afa93d2c73783efe5af80ff3082be2cc1683dfe21041' 
  AND token = 'fTlugQ0OtEgvufJ2qaMSUHva3aeHBlIU29EGkro/Uuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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