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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0b604e7877a6231ea83d09c97307897ee3020fefe58c4ace9810aa1394513b' 
  AND token = 'RyP0Z0wDmS0DeBrgApzwGri95PL3OJbdA1/Q+KFH+LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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