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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9336bb9f0f48cae9964f720d4c1169b78468772fdc6a441b62652294b1ecccd' 
  AND token = 'IN3D205FW0ZV2McZUsjzekrHS1YPWyfol3Buzu2Vb4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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