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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2789b1a4552816b3e58384e47b04b65579d6027fa3bdc0c556a8f894e2442f' 
  AND token = 'hk/8GxArs881FQ69rajuwl8TaukvR96i3q4s6G9a8pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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