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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40964507b8b5d4c64cb51be22fa6ef70a0fb1af5d4fae313359cfc474242cbd5' 
  AND token = 'LG6bfZxe/oAMlcObEevNbB33Wegkbb3w8gEy5M2/894=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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