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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d06bc4d013b6c59263fdd82f3287a70ff2a16d32df085c920e0f183f1c375c' 
  AND token = 'BSBJdxb6eN8ZnLtkK1wPPX8ZWiJ0sEWKaHFQTt4mvZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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