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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7ab09c496be8e43528e420cef7e057c92af2348b62843659c40e3ad7f8ff5f' 
  AND token = 'y/OJvBOBPd/mBe4LWTS0hq04UU6gTPmlCwGBMCGibgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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