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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a98eee690f7a1296850e8e50bf4bf55a45677f8b7cbfe9feb339feb4533793d' 
  AND token = 'q5htxT53kD3xID1dwMunYlELYZLrrSe5wv8IOmuFAW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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