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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e362433d514a5574db22f1f727ffc7b96935c9737b24670cdf7ac3ddd8bc048c' 
  AND token = 'I077RygqxTALL6ff8UrSqaN8DvVkJ2nYdLrH1cK3R+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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