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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d734d50395f762e65d4803e9455f8171c7a7db7ebcd890b1de46b507c9ad750' 
  AND token = 'iFt2i5kCQI8uEobhmJLjNkPFAio0roRqie75FB5nu+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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