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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896be8da2f2258ef5b3d1d0b431184f7afe5e506de4cdffb1b88a1c2471c6361' 
  AND token = 'jH/QqPXI0pd8ZOOGlj6xT3daduBLnFFaDHXvssv2l4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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