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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1464a6fdbe9f5c90987f358d9e417aedf87f2799b65af6f89f5eb85c14236bf5' 
  AND token = 'e4golytgLfBMZQgVcnai9OXdwP/vx7hPqkvibQwQeWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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