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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7809cb01f79734e83b1ad55e90426f32e87e18d1443c8f2e06cfc124a7e8a49c' 
  AND token = '5OkQDnmNWMitr4BDNxQTutiMdkLPdBLLSZijFmLhwcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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