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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5deaf5dae9f7a3c629497cca733bc158b3ab449496781d3b71221c2e9eeb1198' 
  AND token = 'c1LhATZarfeq3EYbf60tclmsdU7L7cxd9CtBDhsSc40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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