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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87aeba7e8d3356ba30b86f47fe360e607d9a2537a115e829645067ebc5a18f90' 
  AND token = 'TZlN11xhkb5D94JiUgmbPd8nlSfWAF5pX/jV64gNg2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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