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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4de99e82186e197d6b623f4c301f11fc77e526a37f938f7a6ce164ee815308b' 
  AND token = 'bi52ShDXiyqSlMkUoVoQyWUtAswR8j+HmFxg9IRR8SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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