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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157342eb029a9e2657e37ba3b4b8b31bc037c75a950cfc65c7ad375bd05f96a1' 
  AND token = 'FrLVwMN1lrbRPyg5KOosWHzT16DQctjiS5LThyaJ1MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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