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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3badbe2594803d2cd47b0ab9dbcba719a0b908381e0b3909193a2132ea55b3f4' 
  AND token = 'qQ/FDXi9AILR08v8edyY/zjclMNcGl8QyUI1CuTVAoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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