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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c8d6fb9ec01de06a97cd31c2fedf8180fcb1ee36bd0f53bc4a5bc1a4e9226d' 
  AND token = 'Mlirlpd/RpBB8wPn8+nUf3B5+vddSA9UNFe3+LxtaXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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