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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1700dabb4bfa84e833f17d31ad2d7791ae3a2cfa5c5b26224c5b2e1389e99f9f' 
  AND token = 'Ig9qPFFESMPF3p+nWzo+FI0/1sQLjx7DJrZQaQQl+cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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