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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60223ba462c6ef694bf144fcacda3e8991a05110fe11503ab1cf227331c7b544' 
  AND token = 's0AfduB4FwMi7r6ucXvx6RW6p1IG5LctsR8KIc/4hv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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