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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a363670819aeb62ece4d81afeea19792b25c8c2246a64fc841b6e943959537ba' 
  AND token = 'x51xpoYtP1SIAY3vv2ZWLR1tCArul50+YzKhG/o1S9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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