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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2b29998bfc9a8156a2fab89fd4087959a17c5911b7ea4669ae9f2524643d8a' 
  AND token = 'sxpiy8/f0at0ff7zVgxU1t59voBZ74lPXLZf9V1o2i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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