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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39de70081799218f37737f547adaf7a22560fc59897d781037c355c6f1adeee6' 
  AND token = 'gopKWa/2Th7M93ioki+GcO6cyUUpBH5PmB0R95c+GJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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