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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05aaeff47f93746a6da761ac6b9e9e0b2305863a8502a7abb7c50f5f1cba650b' 
  AND token = '578Qey9+o4WS/ImYwX3ghfAB0CQEU/uYxfw/vaGMkKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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