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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751337ca4073716ee2397af74c604bbc3a9ae4cf12aefded1d95a97ac99c59ca' 
  AND token = 'cbn7yP2HkK5rxT6g8NTr+wpqVYlgMaRcqjMcU04P7Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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