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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b558b79b4f08401d43dadf0abb7faeeb0c6f5245796e190dca829c907ec945' 
  AND token = 'O2Asn6hvRwuIMfSeMgIIJX4yldpHWiplkebV5EyVLpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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