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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1235a991c100bf30c6fa50ac747656e750061d0fb494be5bbcae0aff8abbd5' 
  AND token = '28y7KRrAnRemb/Mx9Yn+zaF+KerHYtX09zql2SRKTFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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