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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8aa33e141752698fa2cfb9425799d53ab5eabc8ddd1b02bdc3d15d2f996e77' 
  AND token = 'eQfdOyS/7vuO8uh3nPssM2Gb1+gbFDpqWZgTtLNTViw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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