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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54473abcb2a46183707fb8e65c1a9836f759866b28821b20a178938a4bc0de06' 
  AND token = 'B4H2BKdYKgdCmmdZlDTMp9CQiWoHCKO0uNgXyru4ekE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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