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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1862e9ae864ce69b0428200588f962ba68bcb50979e6b5a6c0be52b702175e6' 
  AND token = '9sHSHy4g6xY7C0KkKysYxZNHFx55fsfQ88rRRZz/Nyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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