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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cedae40d59b4a852aff181c155fb7fd6736ed23e648f42f3eeb75a269259fbe' 
  AND token = 'oSwsRo8wTZ3AocX2UoX3EUTQYIo50Owa7F2mQpviNYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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