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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d11a5ad1ec6cc64c42bab39961135ed1deffc82992db2fe98d3cfd27bf5bc1' 
  AND token = 'vhyrf34gYfhkCbqVR11vDlemKeG+Ea+2ysG0iUpO4cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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