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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd953cfa2f8e4b974a9034b430f9983e81b3282f7984d18f877aa121a0b6d1b4c' 
  AND token = 'ISZtC1dGCS37HVzirnsxH4Sb8SXzV82KtvYbnfjIvW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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