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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b5e8ad4139e01f385bf911c81b0605902cce0606e0e7b9947a7c79834ceb1e9' 
  AND token = 'pLj+fNMAvcJufjNOudVeghVpcCr+8+zOUJoDxaUHQ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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