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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6160e58ca7c28deab888dd4e7a4c1914410aa3ca3bae0e2638f7b44568071d' 
  AND token = 'U3QnAIu1K4nb7afqn11Dq49zmhtlmQPEI64yFtlaQOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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