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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd560953fd031e414c2e9e6ec5f07c575d790a2404b0945df2fb13a4b05cdf606' 
  AND token = '4bzVcYxWzB+cbphDI3SOSMqI93b1mfStYqf7yIS7cpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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