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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699796432746209a0fe57639d47c349ce315731cd76aebbe90fb62ecc704c282' 
  AND token = 'wbA57G1wsamdVeMpimsGvrGN2k13G4dK90/5tF03t6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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