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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd79108af5e61e92f4f4ecef1da23e8097570680f30e3926f147b3e0e6544b3' 
  AND token = '3BxABG2OIQpGNddyFVbMrU/7OtCvJ407z1t+fR3ufOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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