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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f5a5f1f031d48caeb421f80140d81480d888ed6961715f2ae75d97fae33ea8' 
  AND token = 'UlgrHgMdX7tcEaYPXuzv5IESXYOP1WLJvHi2PNTtoAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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